Sharpener for lawn-mowers.



N. SPBGK.

, SHARPENBR FOR LAWN MOWERS.

APPLIUATION FILED JUNE zo, 1912.

1,076,919. Patented Oct.28,y1913.

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Nlll-IOLAS SPECK, 0F MONROE, WSGONSIN. ASSGNOR 0F ONEJTHIRD T0 HENRY JOHANNET AND @NE-THIRD T0 JAMES O. FIDLER. 0F MONRE, WISCGNSIN.

.aannemen ron Lawn-nowans.

i ,omni o.

Sp enieation of Letters ha tent.

'Patented Det. 28, '1 913.

Application nlcd June 20. 19172. Serial No. 70428.72.

To all whom *it may concern lie it known that l, liicnoiias Senna, a citizen of the United States of America, and resident of lMonroe, in the. county of Green and State of lllfisconsin, have invented certain new and use'liil lniproi-'enients in harpencre for Lan'n-ll/loivers, of which lthe 'following in a specification.

rlhis invention relates to Sharpeners tor laivii mowers and has for its object .the provision of novel means for guiding the sharpxenlino,i device with relation to the h lades of a lawn mower, ineens being provided for permitting the adjust-nient of the parts in order 4that the said Sharpener may be regulated to operate .in conjunction with lawn mowers of different proportions; or types.

A still further object of lthis invention is to provide novel means for clamping the sharpeiiini` tool and for adjustin the guiding means with relation thereto 'or the purpose indicated, means being also provided for sharpening the stationary knife of a lawn mower simultaneously with the sharpenifno" of the cutter hlades thereof.

Wfith the toiegoiing;r and other objects in View, the invention consists in the details oit i construction and in the arrangement .and combination of parts to .he hereinafter more tally set forth and claimed.

ln describing the invention in detail, reterence will he had to the accompanying drawings forming part of this Specification wherein like characters denote corresponding parts in the several views, and in' l s mpi .the sharpeningtool 16 against the under Which- Figure l illustrates a perspective view o l a portion of a lawn mower showing the application of the invention to the blades thereof; Fig'. 2 illustrates a view in elevation of the sharpening device; Fig. 3 illustrates a top plan View thereof; Fig. l illustrates a side elevation ot' a fragment of a blade with the tile applied thereto; and Fig. 5 illustrates a face view' oit the tile. Fig. G illustrates a. perspective view of a three cornered file to he used in combination with my invention.

ln these drawings 4 denotes a stationary knife of a lawn mower in conjunction with which the rotary blades are adapted tooperate the said blades 5 being' mounted on,

rotatable carriers of any appropriate type. as blades ot lawn mowers are usually of curved formation, l have illustrated the blades of the lawn mower to which the sharpening device is applied as extending spirally ahout the axis upon which they are mounted and will describe the sharpening device and the operation thereof by referringr to the illustration of the lawn mower.

The sharpening device comprises a body 6 provided with a longitudinally disposed slot 7. said hody having handles 8 and 9 at the ends Ithereof. A clamp is adjustable longitudinally of the slot and comprises a. block Si which is approximately the width of the slot 7 and is slidable therein, the said block having an integral shank l0 extending above the u )per Surface oil the hody and screw threaded to neceive the wing nut 11, the rolation of which on the threaded shank serves to draw the block or body 9a upwardly into theslot or permits it to descend therein according to the rotation of the said wing nutl mi.

As shown in the drawing, the block 9a is provided with a transversely disposed recess i2 foi-mingslioulders 13 and 14@ on which a file l5 or other sharpening" tool may he su'rface of the hody and serving to hind the said sharpening tool in position so that it cannot he moved :trom its seat. The body 6 is provided with guides 17 and 18, the former ot which is intended to ride on the stationary knife of a lawn mower and the latter of which is intended to ride on a cross rod 19 which is universally employed in the construction ol lawn mowers. The guide 17 is shown as havingI a circular socket 20 which may contain a three-cornered le 21 lor the purpose of sharpening' the knife 4i of a lawn mwer but when the knife -l is not to he sharpened. the guide 17 may he caused to slide thereon for the purpose of guiding the sharpening device intended to operate on the blades 5.

The guide t7 has a threaded shank 22 which extends through the. slot of the lid .by threaded shank, the

justed longitudinally of the body forethe lower surfaces respectivelv of the body and j on the purpose of bringing the guide 17 into proper operative relation to the knife of the lawn mower. Likewise, the guide 18 is provided w1th a threaded shank having nuts 2G and 27 for binding against the upper and .lower surface respectively of the body in order that the guide '18 may be adjusted to differentpositions to accommodate itself to lawn mowers of different sizes. As the block 9 and the Shar ening tool 16 are also" movable longitudinal y of the slot 7, it follows that the guides and the sharpening tool may be adjusted so that the distance between the guides may be varied or the distance between the sharpening tool and either of the guides may be changed in order that the guides-may engage appropriate stationary guiding members on the lawn mower and the sharpening tool may be caused to contact. with any one of the blades of a lawn mower so that by movement of the said sliarpenin dev-ice transversely of the lawn mower, t e sharpening tool may operate on the blades.

In adjusting the sharpening device, the guiding member 1S is adjusted so that it will fit the rod 19 whereas the guide 17 is adjusted to vfit directly over the edge of the knife. The blade to be sharpened is then inserted in the. block under the file or sharpeningtool after .which the sharpening device is moved from end to end ofthe blades. If it is foundthat the blade is not sulficiently sharpened by the operation just ing dicated, the threaded shank of the guide 17 or 18 accordin to the position of the beveled surface o the knife is moved a little 1. In a Sharpener for lawn mowers, a

body portion having a longitudinally'disposed slot, said body portion terminating in handles, guides having threaded Shanks adjustable longitudinally of the said body and vertically thereof, and a clam for a shar ening tool adjustably secured) between tie walls ofthe slot..-

2. In a Sharpener for lawn mowers, a body having a longitudinally disposed slot, guides having threaded Shanks extending transversely through the said slot., means for clamping the Shanks at different positions of adjustment with relation to the body, a clamp fora sharpening tool comprising a block movable in the slot, said block having a transversely disposed recess forming shoulders, a sharpening clamped between the shoulders and the bodyj` and means for operating the clamp for retaining the sharpening tool therein.

3. Ina Sharpener for lawn mowers,a body, a file supporting member carried by the body portion, a shank carried by the tile supporting member, and means coperating with the shank for adjustably securing the tile supporting member in positions of adjustment. and at the same time holding the file into engagement vwith the body portion.

In testimony whereof, I aiiix my signature in the presence of two witnesses.

NICHOLAS SPE CK. Witnesses F. E. CoRsoN, M. J. KNIGHT.

tool 

